examples/api/lib/widgets/heroes/hero.0.dart

// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'package:flutter/material.dart';

/// Flutter code sample for [Hero].

void main() => runApp(const HeroApp());

class HeroApp extends StatelessWidget {
  const HeroApp({super.key, this.navigatorObservers});

  final List<NavigatorObserver>? navigatorObservers;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      navigatorObservers: navigatorObservers ?? <NavigatorObserver>[],
      home: const HeroExample(),
    );
  }
}

class HeroExample extends StatelessWidget {
  const HeroExample({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Hero Sample')),
      body: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: <Widget>[
          const SizedBox(height: 20.0),
          ListTile(
            leading: const Hero(
              tag: 'hero-rectangle',
              child: BoxWidget(size: Size(50.0, 50.0)),
            ),
            onTap: () => _gotoDetailsPage(context),
            title: const Text('Tap on the icon to view hero animation transition.'),
          ),
        ],
      ),
    );
  }

  void _gotoDetailsPage(BuildContext context) {
    Navigator.of(context).push(
      MaterialPageRoute<void>(
        builder: (BuildContext context) => Scaffold(
          appBar: AppBar(title: const Text('Second Page')),
          body: const Center(
            child: Hero(
              tag: 'hero-rectangle',
              child: BoxWidget(size: Size(200.0, 200.0)),
            ),
          ),
        ),
      ),
    );
  }
}

class BoxWidget extends StatelessWidget {
  const BoxWidget({super.key, required this.size});

  final Size size;

  @override
  Widget build(BuildContext context) {
    return Container(width: size.width, height: size.height, color: Colors.blue);
  }
}